1。在内核中打开:

 

  │ Symbol: SYN_COOKIES [=y]                                                │ 
  │ Prompt: IP: TCP syncookie support (disabled per default)                │ 
  │   Defined at net/ipv4/Kconfig:287                                       │ 
  │   Depends on: NET && INET                                               │ 
  │   Location:                                                             │ 
  │     -> Networking                                                       │ 
  │       -> Networking support (NET [=y])                                  │ 
  │         -> Networking options                                           │
  │           -> TCP/IP networking (INET [=y])

 

2。启动系统时增加下面选项:nano -w /etc/sysctl.conf

     net.ipv4.tcp_syn_retries = 1
     net.ipv4.tcp_synack_retries = 1
     net.ipv4.tcp_syncookies = 1

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